package com.yueyi.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import com.yueyi.common.exception.NoStockException;
import com.yueyi.common.to.OrderTo;
import com.yueyi.common.to.mq.StockDetailTo;
import com.yueyi.common.to.mq.StockLockedTo;
import com.yueyi.common.utils.Query;
import com.yueyi.common.utils.R;
import com.yueyi.gulimall.feign.OrderFeignService;
import com.yueyi.gulimall.feign.ProductFeignService;
import com.yueyi.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.yueyi.gulimall.ware.entity.WareOrderTaskEntity;
import com.yueyi.gulimall.ware.service.WareOrderTaskDetailService;
import com.yueyi.gulimall.ware.service.WareOrderTaskService;
import com.yueyi.gulimall.ware.vo.OrderItemVo;
import com.yueyi.gulimall.ware.vo.OrderVo;
import com.yueyi.gulimall.ware.vo.SkuHasStockVo;
import com.yueyi.gulimall.ware.vo.WareSkuLockVo;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yueyi.common.utils.PageUtils;

import com.yueyi.gulimall.ware.dao.WareSkuDao;
import com.yueyi.gulimall.ware.entity.WareSkuEntity;
import com.yueyi.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
@Service("wareSkuService")
@RabbitListener(queues = "stock.release.stock.queue")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    OrderFeignService orderFeignService;


    /**
     * 解锁库存的方法
     * @param skuId
     * @param wareId
     * @param num
     * @param taskDetailId
     */
    public void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId) {

        //库存解锁
        wareSkuDao.unLockStock(skuId,wareId,num);

        //更新工作单的状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setId(taskDetailId);
        //变为已解锁
        taskDetailEntity.setLockStatus(2);
        orderTaskDetailService.updateById(taskDetailEntity);

    }
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //没有库存记录就是新增
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0){
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStockLocked(0);
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0){
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(wareSkuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> skuHasStockVos = skuIds.stream().map(item -> {
            Long count = this.baseMapper.getSkuStock(item);
            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();
            skuHasStockVo.setSkuId(item);
            skuHasStockVo.setHasStock(count == null?false:count > 0);
            return skuHasStockVo;
        }).collect(Collectors.toList());
        return skuHasStockVos;
    }

    /**
     * 为某个订单锁定库存
     * @param vo
     * 默认只要是运行时异常都会回滚
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        //保存库存工作单 追溯
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());
        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count == 1){
                    skuStocked = true;
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(detailEntity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity,stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if (!skuStocked){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }

        }
        //3.肯定全部都是锁成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detailTo = to.getDetailTo();
        Long detailId = detailTo.getId();
        //解锁
        //查询数据库关于这个订单的锁库存信息
        //有：证明库存锁定成功
        //解锁：订单情况
        //1、没有这个订单。必须解锁
        //2、有这个订单。不是解锁库存。
        //订单状态：已取消：解锁库存
        //没取消：不能解锁
        //没有：库存解锁失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null){
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                //订单返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4){
                    //订单不存在
                    //订单已被取消了。才能解锁库存
                    if (byId.getLockStatus() == 1){
                        //当前库存工作单详情，状态1 已锁定但是未解锁才可以解锁
                        unLockStock(detailTo.getSkuId(),detailTo.getWareId(),detailTo.getSkuNum(),detailId);
                    }
                }
            }else {
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }

        }else {
            //无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存优先到期，查订单状态新建，什么都不处理
     * 导致卡顿的订单，永远都不能解锁库存
     * @param orderTo
     */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity orderTaskEntity = orderTaskService.getOrderTaskByOrderSn(orderSn);

        //按照工作单的id找到所有 没有解锁的库存，进行解锁
        Long id = orderTaskEntity.getId();
        List<WareOrderTaskDetailEntity> list = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id).eq("lock_status", 1));

        for (WareOrderTaskDetailEntity taskDetailEntity : list) {
            unLockStock(taskDetailEntity.getSkuId(),
                    taskDetailEntity.getWareId(),
                    taskDetailEntity.getSkuNum(),
                    taskDetailEntity.getId());
        }
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}